Hi @bvp5851pr,
Welcome to the Roku Community!
We understand that you are inquiring about if your Roku Express 3930x is compatible with Roku Voice Remote Pro. Yes, the Roku Express 3930x is compatible with Roku Voice Remote like Roku Voice Remote Pro.
For full information on this, you can take a look at this Support page: What you need to use voice commands with your Roku® streaming device | Official Roku Support
Additional topics you might find helpful:
Hope you'll find this info useful. Let us know in case you've still got any questions.
Best regards,
Mary
Mary F.
Roku Community Moderator